Gap analysis — c12 in decision #640

scry-mcdc · lib.rs:1591 · branch 4279

Status: GAP

What you need

To prove condition c12 independently affects the decision, you need a row where c12 = T and the outcome differs from row 1494 (where c12 = F).

Required condition vector:

  c0 = F
  c1 = F
  c2 = F
  c3 = T
  c4 = F
  c5 = T
  c6 = *
  c7 = *
  c8 = *
  c9 = *
  c10 = *
  c11 = *
  c12 = T
  c13 = F
  c14 = T
  c15 = *
  c16 = F
  c17 = F
  c18 = F
  c19 = T
  c20 = T
  c21 = *
  c22 = *
  c23 = *
  c24 = *
  c25 = *
  c26 = *
  c27 = *

Conditions marked * were short-circuited in the baseline row; the new test must drive inputs so they get evaluated to either T or F.

Suggested test stub

#[test]
fn closes_gap_d640_c12() {
    // Verdict: scry-mcdc
    // Source: lib.rs:1591
    // Branch:  4279
    //
    // TODO: drive the function so condition c12 evaluates to the
    // value above and the resulting decision outcome differs from
    // the existing pair row.
    todo!("witness viz: gap drill-down for d#640/c12");
}

After adding the test, re-run: witness instrument && witness run --invoke run_row_NEW && witness report. The condition should flip from gap to proved.

← back to decision #640